49-TSQ-8M Apex Triple Square Bit, 1/4” Hex Power Drive. Apex Triple Square Screwdriver Bits from Apex Fastener Tools, also known as XZN bits, are designed with 12 equally spaced tips, each with a 90° angle. Its name derives from overlaying 3 equal squares to form such a pattern with 12 right-angled tips. Apex quality begins with select raw materials, only carefully chosen, high grade tool steel is used. Apex Triple Square Screwdriver Bits from Apex Fastener Tools are manufactured to the tightest tolerances in the industry, most are even tighter than licensing agreement requirements and all Apex bits meet the most stringent government and military specifications.